Module java.base
Defines the foundational APIs of the Java SE Platform.
- Providers:
- The JDK implementation of this module provides an implementation of the jrtfile system provider to enumerate and read the class and resource files in a run-time image. The jrt file system can be created by calling
FileSystems.newFileSystem(URI.create("jrt:/")). - Tool Guides:
- java launcher, keytool
- Module Graph:
- Since:
- 9
Packages
Exports Package Description java.io Provides for system input and output through data streams, serialization and the file system.java.lang Provides classes that are fundamental to the design of the Java programming language.java.lang.annotation Provides library support for the Java programming language annotation facility.java.lang.invoke Thejava.lang.invokepackage provides low-level primitives for interacting with the Java Virtual Machine.java.lang.module Classes to support module descriptors and creating configurations of modules by means of resolution and service binding.java.lang.ref Provides reference-object classes, which support a limited degree of interaction with the garbage collector.java.lang.reflect Provides classes and interfaces for obtaining reflective information about classes and objects.java.math Provides classes for performing arbitrary-precision integer arithmetic (BigInteger) and arbitrary-precision decimal arithmetic (BigDecimal).java.net Provides the classes for implementing networking applications.java.net.spi Service-provider classes for thejava.netpackage.java.nio Defines buffers, which are containers for data, and provides an overview of the other NIO packages.java.nio.channels Defines channels, which represent connections to entities that are capable of performing I/O operations, such as files and sockets; defines selectors, for multiplexed, non-blocking I/O operations.java.nio.channels.spi Service-provider classes for thejava.nio.channelspackage.java.nio.charset Defines charsets, decoders, and encoders, for translating between bytes and Unicode characters.java.nio.charset.spi Service-provider classes for thejava.nio.charsetpackage.java.nio.file Defines interfaces and classes for the Java virtual machine to access files, file attributes, and file systems.java.nio.file.attribute Interfaces and classes providing access to file and file system attributes.java.nio.file.spi Service-provider classes for thejava.nio.filepackage.java.security Provides the classes and interfaces for the security framework.java.security.acl The classes and interfaces in this package have been deprecated.java.security.cert Provides classes and interfaces for parsing and managing certificates, certificate revocation lists (CRLs), and certification paths.java.security.interfaces Provides interfaces for generating RSA (Rivest, Shamir and Adleman AsymmetricCipher algorithm) keys as defined in the RSA Laboratory Technical Note PKCS#1, and DSA (Digital Signature Algorithm) keys as defined in NIST's FIPS-186.java.security.spec Provides classes and interfaces for key specifications and algorithm parameter specifications.java.text Provides classes and interfaces for handling text, dates, numbers, and messages in a manner independent of natural languages.java.text.spi Service provider classes for the classes in the java.text package.java.time The main API for dates, times, instants, and durations.java.time.chrono Generic API for calendar systems other than the default ISO.java.time.format Provides classes to print and parse dates and times.java.time.temporal Access to date and time using fields and units, and date time adjusters.java.time.zone Support for time-zones and their rules.java.util Contains the collections framework, some internationalization support classes, a service loader, properties, random number generation, string parsing and scanning classes, base64 encoding and decoding, a bit array, and several miscellaneous utility classes.java.util.concurrent Utility classes commonly useful in concurrent programming.java.util.concurrent.atomic A small toolkit of classes that support lock-free thread-safe programming on single variables.java.util.concurrent.locks Interfaces and classes providing a framework for locking and waiting for conditions that is distinct from built-in synchronization and monitors.java.util.function Functional interfaces provide target types for lambda expressions and method references.java.util.jar Provides classes for reading and writing the JAR (Java ARchive) file format, which is based on the standard ZIP file format with an optional manifest file.java.util.regex Classes for matching character sequences against patterns specified by regular expressions.java.util.spi Service provider classes for the classes in the java.util package.java.util.stream Classes to support functional-style operations on streams of elements, such as map-reduce transformations on collections.java.util.zip Provides classes for reading and writing the standard ZIP and GZIP file formats.javax.crypto Provides the classes and interfaces for cryptographic operations.javax.crypto.interfaces Provides interfaces for Diffie-Hellman keys as defined in RSA Laboratories' PKCS #3.javax.crypto.spec Provides classes and interfaces for key specifications and algorithm parameter specifications.javax.net Provides classes for networking applications.javax.net.ssl Provides classes for the secure socket package.javax.security.auth This package provides a framework for authentication and authorization.javax.security.auth.callback This package provides the classes necessary for services to interact with applications in order to retrieve information (authentication data including usernames or passwords, for example) or to display information (error and warning messages, for example).javax.security.auth.login This package provides a pluggable authentication framework.javax.security.auth.spi This package provides the interface to be used for implementing pluggable authentication modules.javax.security.auth.x500 This package contains the classes that should be used to store X500 Principal and X500 Private Credentials in a Subject.javax.security.cert Provides classes for public key certificates.
Services
Provides Type Description FileSystemProvider Uses Type Description AbstractChronology An abstract implementation of a calendar system, used to organize and identify dates.AsynchronousChannelProvider Service-provider class for asynchronous channels.BreakIteratorProvider An abstract class for service providers that provide concrete implementations of theBreakIteratorclass.CalendarDataProvider An abstract class for service providers that provide locale-dependentCalendarparameters.CalendarNameProvider An abstract class for service providers that provide localized string representations (display names) ofCalendarfield values.CharsetProvider Charset service-provider class.Chronology A calendar system, used to organize and identify dates.CollatorProvider An abstract class for service providers that provide concrete implementations of theCollatorclass.ContentHandlerFactory This interface defines a factory for content handlers.CurrencyNameProvider An abstract class for service providers that provide localized currency symbols and display names for theCurrencyclass.DateFormatProvider An abstract class for service providers that provide concrete implementations of theDateFormatclass.DateFormatSymbolsProvider An abstract class for service providers that provide instances of theDateFormatSymbolsclass.DecimalFormatSymbolsProvider An abstract class for service providers that provide instances of theDecimalFormatSymbolsclass.FileSystemProvider Service-provider class for file systems.FileTypeDetector A file type detector for probing a file to guess its file type.LocaleNameProvider An abstract class for service providers that provide localized names for theLocaleclass.LoginModule Service-provider interface for authentication technology providers.NumberFormatProvider An abstract class for service providers that provide concrete implementations of theNumberFormatclass.Provider This class represents a "provider" for the Java Security API, where a provider implements some or all parts of Java Security.ResourceBundleControlProvider An interface for service providers that provide implementations ofResourceBundle.Control.ResourceBundleProvider ResourceBundleProvideris a service provider interface for resource bundles.SelectorProvider Service-provider class for selectors and selectable channels.System.LoggerFinder TheLoggerFinderservice is responsible for creating, managing, and configuring loggers to the underlying framework it uses.TimeZoneNameProvider An abstract class for service providers that provide localized time zone names for theTimeZoneclass.ToolProvider An interface for command-line tools to provide a way to be invoked without necessarily starting a new VM.URLStreamHandlerProvider URL stream handler service-provider class.ZoneRulesProvider Provider of time-zone rules to the system.